Blading for elastic-fluid turbines.



J. S. GREEN. BLAD1NG-POR ELASTIG FLUID TURBINBS.

APPLICATION FILED AUG. 6, 1908.

Patented Mar. 1, 1910.

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WITNESSES UNITED srarnsririjasr carica.

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JONATHAN S. GREEN, OF PITTSBURGdPENNSYL HOUSE lVlIACIIINE COMPANY. A CORGBATION OEPENCSYLVANIA.

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BLAnInGfsoR' 1 iEiii-is'ric-risnin rtinsrnns.

Application flied August 6.

^ Be it known that l. Joxx'iiixx SGREEN,

a citizen of the nited States, ant. a resi- Speccatonof Letters Patent.

Patented Mar. i. 1910.

1588. Sciial No. 447.230.

vanes and the terni blade-carrying elef nient" will denote either the stationary 'or glieny andgitate of Pennsylvania, have-I inadea' neT `and useful invention in Blading for Elastic-FluidTurbines. following is a speciiication.-

.This invention relates to elastic tluid turbines and more particularly to blading for such turbines.

and positively securing the turbine blades into 'segmental rings which may be subsequently secured to the blade-carrying ele- ',i'nents of the turbine.

In the drawings accompanying this application and forming apart thereof, Figure 1 1- of which the 1 the rotating blade-carrying element.

alanis. assieivro'iiJ Torrisi: Wesfriivs- Referring to the drawings: The bladecarrying element 6 provided with a plurality of circuinferentially-extending andl undercut blade-mounting grooves T, in which a base. strip 8` and a plurality ot' blades 9 are secured by ineans of a c'alking 4strip 10. The base strip is rolled or otheri "wise formed in segmental section and is An object of this invention isto provide simple and effective means for assembling provided along oneside with a plurality ci? laterally-extending notches 11 which are cut into the maior portionof the strip at an angle ofabout (SOQ to its longitudinal axis.

is a fraginental transvei'sesection of a rotor i element provided with blades shown in elevation and, ino-tinted in accordance with my invention; lTi-g.- 2 is a section along the line line B-B of F ig.-

lig. l is a perspectivel view of a blade forming a detail of my invention; and, Fig. -5 is an end view if a blade strip included in my invention..

Fig. 3 is a section along the In carryingout my invention I provide a g base strip which is notched along one side to receive the bases of the blades.

One end j.

of each blade is swaged to form an L-shaped or angular mounting portion, one leg ot Which is adapted to be inserted into one of the notches in the base strip and the other f f leg of which is adapted Ito lie alongside of the side of the strip between the notches. I also employ means for positively locking the blades together and for positivelyY securing them to the base strip.l The longer leg of the mounting portion of each blade, that is, g the leg adapted to extend into one of the i notchesin the base strip, is provided with a tlieieli hole which extends transversely l through 4and by means of which the blades are strung onto a rod or wire, which, when j the blades are in place on the base strip,- vis located i'n a slot extending longitudinally of the strip and intersecting the notches provided in the strip.

For the sake of brevity and also for convenience of description, the term blade or bla-des Will be employed throughoutthe speciication and in the claims to denote either the rotating blades or the stationary The notched face of the strip is inclined to t correspond to the inclination of one wall of' `the blade groove. which is slightly und-ar! vided with a hole l5 which. extends therethrough and is located in close i'vioxiinitiY to the shorter leg. The. leg l-l is adapted to be inserted into oneof the notches ll of the strip 8 and the legs are so inclined relative to each other that the leg 16 will litl alongside the inclined face of the strip.l between adjacent notches, when the leg 1l. is in place within one of the notches.

The blades are strung on a rod or ivii'e l'i'which is adapted to extend through the holes l5', in the base portions before tlieiY are assembled into the base strips. The slot 13 of the base strip is so located as to receive the rod 17 when the leg-sil of the bases of the blades are located within the notches.

A shroudiiig channel 18, if desired. ina}r be provided for the outer or free ends ofthe blades.v 'This channel is provided with a plurality of suitably spaced holes 20,ivhich extend through its web portion and through which tips 21, formed on the outer ends ot the blades, are adapted to extend and, by being riveted over, to rigidly secure the channel in place.

Afterl the blades have been assembled into a segmental ring, each base strip isso lo- `of the slot and by being ca'lked oi transg Versely expanded forces the legs 1G, of the base portion of each blade of the strip, into t ripping contact with the undercut wall of f tie groove'and thereby iositively locks the i base strip and the bla es in place. The

Wire 17 positively locks the bases of the blades together and positively locks each vblade to the base strip.

Various means may be employed for securing the outer ends of the blades together f or for securing the blade strips into the blade-'mounting slots and blades of various contours may be assembled in blade rings 'in accoidaiice with this invention.

In accordaneevivith the provisions of ,the patent statutes. I have desoriljied the principle of operation ot my invention, together wit-li the apparatus vvhich AI. non' consider Q to representthe best embodiment thereoi, but I desire to have it understood that the 4 apparatus shown only illustrative and,

that the invention can ie carried outl by i E of notches; blades 'provided with bases other means. I

What I claim is: y 1. In combination in a turbine, a notched blade strip, blades provided with bases,

sivaged to he notches and a locking Wire i a bladestri provided with a plurality of notcheshblac es provided with base portions ada )ted to engage said notches and to lie against the notched face of said strip and means comprising a rod passing throuvh said blades for positively locking said blaf. es together and to said strip when said strip is secured into said groove.

4. In combination with' a turbine bladecarrying element provided with a groove, a blade strip provided with a plurality of notches, blades provided with bases adapted to engage, but to project from said notches and means comprising a rod passing through said blades for positively locking the blades to said strip when said strip is secured into said groove. ,f

In combination with a turbine, a base strip provided with a pluralit of notches, blades provided `with bases a apted to engage but to projecty from said notches and' a stringer member secured in lace on said strip for positively flocking said blades toltether and to said strip.

6. In combination with a turbine, a bladecarrying member provided with a plurality adapted to engage but to project from said extending through holes provided in the4 bases of the blades and secured in place within 'a slot provided on said base strip for positively looking` the blades together to Said strip.

Q. In con'ibination with a turbine blade.- i

carrying element provided with a a blade strip provided with aplurality ot blade-mountinn` notches` blades provided;

with base portions adapted to extend into said notches, a rod extendingv through holes provided in the base portions of the blades and means for securing said blades in said notches by securing said strip into one of said grooves.

3. In Combination with a turbine bladecarrying element provided with a groove,

notches and a stringer member for positively ylockingsaid blades together and to said strip and located Within a slot provided in said strip.

7 In combination with a turbine, a bladearrying member provided with a groove, a base stiip provided with a plurality of blade-mounting notches, blades provided with bases adapted to engage but to project from said notches and a rod extending through holes provided in the base portion of said blades and located in a slot provided in said strip.

In testimony whereof, I have hereunto JNO. S. GREEN.

Witnesses: BIRNEY HiNEs` l GEO. A. WALKER.

subscribed mynamev this 4th day of August, 

